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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765915b79e7c741b1b8e2b65d38a42caa560b78e51e838e9d6c19bb56108b7f9' 
  AND token = '8YobgsbELxM7LRRSC0GHk7ozqfiUq9i3ThA/mcbrbPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}